The official lie: Einstein was able to predict, WITHOUT ANY ADJUSTMENTS WHATSOEVER, that the orbit of Mercury should precess by an extra 43 seconds of arc per century:

http://physics.ucr.edu/~wudka/Physics7/Notes_www/node98.html"This discrepancy cannot be accounted for using Newton's formalism. Many ad-hoc fixes were devised (such as assuming there was a certain amount of dust between the Sun and Mercury) but none were consistent with other observations (for example, no evidence of dust was found when the region between Mercury and the Sun was carefully scrutinized). In contrast, Einstein was able to predict, WITHOUT ANY ADJUSTMENTS WHATSOEVER, that the orbit of Mercury should precess by an extra 43 seconds of arc per century should the General Theory of Relativity be correct."

In fact, Einstein changed his theory several times until eventually it "predicted" the known-in-advance precession. According to Etienne Klein, if Popper's criteria had been respected, the theory's failure to account for the precession of the perihelion of Mercury should have led to its rejection: